ta có:
\(abc5-1107=5abc\)
\(1107=abc5-5abc\)
\(\Rightarrow abc5-5abc=1107\)
\(\Rightarrow abc\cdot10+5-5000-abc=1107\)
\(abc\cdot10-abc=1107+5000-5\)
\(abc\cdot9=6102\)
\(abc=6102:9=678\)
VẬY \(abc=678\)
TK MK NHA. ^_^
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